<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="(cart,index) in cartInfoList" :key="cart.id">
          <li class="cart-list-con1">
            <input type="checkbox" name="chk_list" :checked="cart.isChecked==1" @change="changeCart(cart,$event)">
          </li>
          <li class="cart-list-con2">
            <img :src="cart.imgUrl">
            <div class="item-msg">{{ cart.skuName }}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{ cart.skuPrice }}.00</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="handler('minus',-1,cart)">-</a>
            <input autocomplete="off" type="text"  minnum="1" class="itxt" :value="cart.skuNum" @change="handler('change',$event.target.value*1,cart)">
            <a href="javascript:void(0)" class="plus" @click="handler('add',1,cart)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ cart.skuPrice * cart.skuNum }}</span>
          </li>
          <li class="cart-list-con7">
            <a href="#none" class="sindelet" @click="DeleteShop(cart)">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" :checked="isAllCheck&&cartInfoList.length>0" @change="updateAllChecked">
        <span>全选</span>
      </div>
      <div class="option">
        <a href="#none" @click="deleteAllCheckedCart">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>0</span>件商品</div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ totalPrice }}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import {mapGetters} from 'vuex'
//按需引入lodash节流函数
import throttle from "lodash/throttle";
  export default {
    name: 'ShopCart',
    mounted() {
      this.getData()
    },
    methods: {
      //获取个人购物车数据
      getData(){
        this.$store.dispatch('getShopCart')
      },
      //修改购物车某一个产品选择的个数,通过throttle让删除功能函数节流
      handler: throttle(async function (type, disNum, cart) {
        //type：+/-/input三个元素的种类，disNum：+变化量（1） -变化量（-1） input最终的个数（并不是变化量） cart:哪个产品（身上有id）
        switch(type){
          case 'add':
            disNum = 1
            break
          case 'minus':
            //判断选择的商品个数是否大于1，如果是则给服务器传1否则传0
            disNum = cart.skuNum > 1 ? -1:0
            break
          case 'change':
            //用户输入进来的最终量是非法的（带有汉字）或者负数，则给服务器返回disNum变化量为0
            if(isNaN(disNum) || disNum < 1){
              disNum = 0
            }else{
              //属于正常情况，输入值不是非法，但是如果为小数我们需要取整，给服务器带去变化量
              disNum = parseInt(disNum) - cart.skuNum
            }
            break
        }
        //派发action
        try{
          //表示修改成功,这里派发只需要传入变化量disNum即可，具体展现的数据变化逻辑是后端所处理的
          await this.$store.dispatch('AddShopCar',{skuId:cart.skuId,skuNum:disNum})
          this.getData()
        } catch(error){

        }
      },500),
      //删除某一个产品的操作
      async DeleteShop(cart){
        try {
          //如果删除成功，再次请求新的数据展示页面
          await this.$store.dispatch('DeleteShop',cart.skuId)
          this.getData()
        } catch (error) {
          alert(error.message)
        }
      },
      //修改某一个产品的勾选状态
      async changeCart(cart, event) {
        try {
          let isChecked = event.target.checked ? 1 : 0
          await this.$store.dispatch('CheckCart', { skuId: cart.skuId, isChecked: isChecked })
          this.getData()
        } catch (error) {
          alert(error.maseege)
        }
      },
      //删除全部选中的商品
       async deleteAllCheckedCart(){
        try {
          //派发一个action
          await this.$store.dispatch('deleteAllCheckedCart')
          //如果awit等待等promise返回成功则继续执行后面的代码，在没有返回前阻塞后面的代码执行
          //promise成功返回再次请求获取购物车数据
          this.getData()
        } catch (error) {
          alert(error.message)
        }
       },
       //全选的业务,更新全部产品的状态
      async updateAllChecked(event) {
        //获取全选的复选框勾选的状态,接口需要的1|0
        let isChecked = event.target.checked ? "1" : "0";
        try {
          //await等待成功:购物车全部商品勾选状态成功以后
          await this.$store.dispatch("allUpdateChecked", isChecked);
          this.getData()
        } catch (error) {
          alert(error.message);
        }
      },
    },
    computed:{
      ...mapGetters(['cartList']),
      //购物车数据
      cartInfoList() {
        return this.cartList.cartInfoList || []
      },
      //计算购买所有产品的总价
      totalPrice(){
        let sum = 0
        this.cartInfoList.forEach(item => {
          sum+=item.skuNum * item.skuPrice
        })
        return sum
      },
      //判断底部复选框是否全部勾选
      isAllCheck(){
        //通过数组every方法判断数组元素的isChecked属性是否全都等一1，如果都符合条件则返回true，否者false
        return this.cartInfoList.every(item=>item.isChecked==1)
      }
    }
  }
</script>

<style lang="less" scoped>
  .cart {
    width: 1200px;
    margin: 0 auto;

    h4 {
      margin: 9px 0;
      font-size: 14px;
      line-height: 21px;
    }

    .cart-main {
      .cart-th {
        background: #f5f5f5;
        border: 1px solid #ddd;
        padding: 10px;
        overflow: hidden;

        &>div {
          float: left;
        }

        .cart-th1 {
          width: 25%;

          input {
            vertical-align: middle;
          }

          span {
            vertical-align: middle;
          }
        }

        .cart-th2 {
          width: 25%;
        }

        .cart-th3,
        .cart-th4,
        .cart-th5,
        .cart-th6 {
          width: 12.5%;

        }
      }

      .cart-body {
        margin: 15px 0;
        border: 1px solid #ddd;

        .cart-list {
          padding: 10px;
          border-bottom: 1px solid #ddd;
          overflow: hidden;

          &>li {
            float: left;
          }

          .cart-list-con1 {
            width: 15%;
          }

          .cart-list-con2 {
            width: 35%;

            img {
              width: 82px;
              height: 82px;
              float: left;
            }

            .item-msg {
              float: left;
              width: 150px;
              margin: 0 10px;
              line-height: 18px;
            }
          }

          .cart-list-con4 {
            width: 10%;

          }

          .cart-list-con5 {
            width: 17%;

            .mins {
              border: 1px solid #ddd;
              border-right: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }

            input {
              border: 1px solid #ddd;
              width: 40px;
              height: 33px;
              float: left;
              text-align: center;
              font-size: 14px;
            }

            .plus {
              border: 1px solid #ddd;
              border-left: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }
          }

          .cart-list-con6 {
            width: 10%;

            .sum {
              font-size: 16px;
            }
          }

          .cart-list-con7 {
            width: 13%;

            a {
              color: #666;
            }
          }
        }
      }
    }

    .cart-tool {
      overflow: hidden;
      border: 1px solid #ddd;

      .select-all {
        padding: 10px;
        overflow: hidden;
        float: left;

        span {
          vertical-align: middle;
        }

        input {
          vertical-align: middle;
        }
      }

      .option {
        padding: 10px;
        overflow: hidden;
        float: left;

        a {
          float: left;
          padding: 0 10px;
          color: #666;
        }
      }

      .money-box {
        float: right;

        .chosed {
          line-height: 26px;
          float: left;
          padding: 0 10px;
        }

        .sumprice {
          width: 200px;
          line-height: 22px;
          float: left;
          padding: 0 10px;

          .summoney {
            color: #c81623;
            font-size: 16px;
          }
        }

        .sumbtn {
          float: right;

          a {
            display: block;
            position: relative;
            width: 96px;
            height: 52px;
            line-height: 52px;
            color: #fff;
            text-align: center;
            font-size: 18px;
            font-family: "Microsoft YaHei";
            background: #e1251b;
            overflow: hidden;
          }
        }
      }
    }
  }
</style>